TCP ACK may arrive after the we've corresponding mg_connection has already been closed.
Fixes cesanta/mongoose-os#235

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Remote address is not associated with an outgoing UDP socket.
Instead, it is stored in mg_connection.sa

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https://github.com/cesanta/mongoose-os/issues/229#issuecomment-293613426

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[...] after handing data off to LWIP, do not wait for ACK.
We don't do it in net_if_socket, don't do it here either.
Also prevents multiple send attempt on the same send_mbuf data.

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To aid disagnosing cases like https://forum.cesanta.com/index.php?p=/discussion/397/retries-connecting-to-aws-broker

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If http.auth_{domain,file} are configured, all HTTP requests require valid digest authorization header.
This applies to files served by mg_http_serve as well as synamic endpoints such as /update and /rpc.

mongoose-os#229

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Add `mjs_check_arg()` which checks whether argument is provided, and
checks its type. It simplifies code and makes it smaller (because
error strings are not ad-hoc, so they are not duplicated)

As part of that, also commonize type stringifying: implement
`mjs_stringify_type` and reimplement `mjs_typeof` on top of that.

Use `mjs_check_arg()` in `mjs_string_slice()` and
`mjs_string_char_code_at()`.

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Differences between 3.1 and 3.1.1:
https://github.com/mqtt/mqtt.github.io/wiki/Differences-between-3.1.0-and-3.1.1

None of them are breaking.

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Close cesanta/dev#6974

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This can happen if the underlying LWIP TCP PCB has been destroyed (we got tcp_error_cb).

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By sending close_notify

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Frees up a bit of ram on ESP

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Flags should be 0 for all of these, except PUBREL (flags = 2).

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